Fwd: A bunch of new content has been added to Khan Academy.

[Mel Wade]

If you haven't checked out Khan Academy recently for the subject you teach it would be worth your while.  They have a lot of lessons/video clips you can use in class or for reteaching.

Mel Wade
- If you really want to do something, you'll find a way. If you don't, you'll find an excuse. – Jim Rohn

http://www.melwade.com

---------- Forwarded message ----------
From: Khan Academy <no-r...@khanacademy.org>
Date: Wed, May 1, 2013 at 7:07 PM
Subject: A bunch of new content has been added to Khan Academy.
To: m...@melwade.com

We've added a whole bunch of new Khan Academy content for you to check out. Here's a quick summary: Are 2 magnets stronger than 1? Will the power of two magnets stuck together increase the overall force? Why? Earth's Magnetic Field (how to measure) How can we describe the strength of the Earth's magnetic field using a magnet and a compass? What does this tell us? Inverse Square Law (Method of Oscillation) Here we compare the speed of compass oscillation vs. distance from a magnet. What kind of relationship do we observe. Is it linear? Inverse Square Law (deflection method) Attempt to measure the change in force of a magnet over a distance using the deflection of a compass. What is wrong with this approach? Listen to Variable Resistance Here we draw a line on a page and use it as a variable resistor in series with a speaker. What relationship do we hear? Does it sound linear? Compass Build (magnet orientation) Making a Compass: does it matter if we stroke the needle with the North vs. South pole of the magnet? Why? Compass Build (stroke direction) Does the direction which we stroke the needle determine the final orientation? Compass Interactions If we float two identically magnetized needles they will always orient themselves in the same way. Why? Compass: which way is north? how would you know which way is north if you had no reference? Can the direction of stroke alone tell you this? Are you sure? Floating Magnet Can you use a magnet as a compass? How can you find North vs. South pole? Neutralize a Compass How to neutralize a compass using two needles. How could this help us later? Why does this work? More detail on the Treaty of Versailles and Germany Introduction to the Protestant Reformation: The Counter-Reformation (4 of 4) Introduction to the Protestant Reformation: The Counter-Reformation (4 of 4) Speakers: Dr. Beth Harris & Dr. Steven Zucker How much electrolyte does a single cell need? Observation: when we pull our cell out of the electrolyte it still causes a deflection, which increases when pressure is applied. How could this lead ... Hitler and the Nazis come to power Hitler's Beer Hall Putsch Initial rise of Hitler and the Nazis Increase Strength of Magnet How can we increase the strength of a bar magnet using a piece of steel? Why is it stronger? Magnet near Compass Exploring the effect of a permanent magnet on compass. What is going on? Tracing a Magnetic Field A compass will align with the lines of force around a magnet. How could you do this in 3 dimensions? ...and there's actually even more, but we don't want this email to be too long. We'd love to know what you think. Leave your comments and questions under the videos, or help teach other Khan Academy students by answering theirs. Cheers, Sal and the Khan Academy Team

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